The calculated distance (air line) between Berchem-Sainte-Agathe and Liège is approximately 58 miles respectively 93 kilometers.
By car or train, the actual journey to Liège is certainly longer, as only the direct route (as the crow flies) between Berchem-Sainte-Agathe and Liège has been calculated here.
Air line (approximately)
93 kilometers
50 nautical miles